Origin:Mainland ChinaItem Type:Ear Care The Oticon MiniFit bass 8mm double vent domes fit with Oticon minifit hearing aids: Oticon Nera, Oticon Alta, Alta Pro, and those hearing aids receivers with new MiniFit speakers. Oticon hearing aid domes should be replaced once a week, because of cerumen "wax" buildup behind the wax guard. Our hearing aid domes fit all ear types, that can be used on behind the ear hearing aids, sound amplifiers, in-ear hearing aids and pocket hearing aids, so you can go on with the life and everyday activities. Please Notice:If have perforated eardrum, please don't use the oticon hearing aid domes. 1 pack, which equals out to a total of10 domes each pack comes with 10 domes to use from. 3 pack, which equals out to a total of 30 domes each pack comes with 10 domes to use from. 5 pack, which equals out to a total of 50 domes each pack comes with 10 domes to use from.